Nexus is truly the best thing to recently have opened in the downtown/East 4th area. As a local clevelander for the past few years, we have needed a spot where people can gather to spend time with friends, read a book, and to also enjoy great coffee (Sumatra). Their coffee and the proceeds specifically helps spread the Christian word to people in another country.
As far as their food, it is definitely 2nd to none in the town where there are numerous great restaurants. I've personally ate crab cake sandwiches, veggie wraps, pizzas, and their panninis leave you wanting to come back for lunch again.